<!DOCTYPE html>
<html lang='en'>
<head>
    <meta charset='UTF-8'>
    <meta http-equiv='X-UA-Compatible' content='IE=edge'>
    <meta name='viewport' content='width=device-width, initial-scale=1.0'>
    <title>Document</title>
    <script src='../vue.js'></script>
</head>
<body>
    <div id='app'>
        <button @click="ishot=!ishot">改变天气</button>
        <div>
            <h1>一下是今天的天气播报</h1>
            <p v-if="ishot">今天真热</p>
            <!-- v-else的使用 必须紧邻v-if 否则无法生效 -->
            <p v-else>今天真冷</p>
        </div>
    </div>
    <script>
        Vue.config.productionTip = false;
        const vm = new Vue({
            el:'#app',
            data(){
                return {
                ishot:true
            }
            }
    })
    </script>
</body>
</html>